3 <title>The source code</title>
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8 <pre class="prettyprint lang-js"><div id="cls-Ext.dd.DragZone"></div>/**
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9 * @class Ext.dd.DragZone
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10 * @extends Ext.dd.DragSource
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11 * <p>This class provides a container DD instance that allows dragging of multiple child source nodes.</p>
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12 * <p>This class does not move the drag target nodes, but a proxy element which may contain
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13 * any DOM structure you wish. The DOM element to show in the proxy is provided by either a
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14 * provided implementation of {@link #getDragData}, or by registered draggables registered with {@link Ext.dd.Registry}</p>
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15 * <p>If you wish to provide draggability for an arbitrary number of DOM nodes, each of which represent some
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16 * application object (For example nodes in a {@link Ext.DataView DataView}) then use of this class
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17 * is the most efficient way to "activate" those nodes.</p>
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18 * <p>By default, this class requires that draggable child nodes are registered with {@link Ext.dd.Registry}.
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19 * However a simpler way to allow a DragZone to manage any number of draggable elements is to configure
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20 * the DragZone with an implementation of the {@link #getDragData} method which interrogates the passed
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21 * mouse event to see if it has taken place within an element, or class of elements. This is easily done
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22 * by using the event's {@link Ext.EventObject#getTarget getTarget} method to identify a node based on a
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23 * {@link Ext.DomQuery} selector. For example, to make the nodes of a DataView draggable, use the following
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24 * technique. Knowledge of the use of the DataView is required:</p><pre><code>
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25 myDataView.on('render', function() {
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26 myDataView.dragZone = new Ext.dd.DragZone(myDataView.getEl(), {
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28 // On receipt of a mousedown event, see if it is within a DataView node.
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29 // Return a drag data object if so.
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30 getDragData: function(e) {
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32 // Use the DataView's own itemSelector (a mandatory property) to
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33 // test if the mousedown is within one of the DataView's nodes.
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34 var sourceEl = e.getTarget(myDataView.itemSelector, 10);
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36 // If the mousedown is within a DataView node, clone the node to produce
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37 // a ddel element for use by the drag proxy. Also add application data
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38 // to the returned data object.
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40 d = sourceEl.cloneNode(true);
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45 repairXY: Ext.fly(sourceEl).getXY(),
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46 sourceStore: myDataView.store,
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47 draggedRecord: v.getRecord(sourceEl)
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52 // Provide coordinates for the proxy to slide back to on failed drag.
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53 // This is the original XY coordinates of the draggable element captured
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54 // in the getDragData method.
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55 getRepairXY: function() {
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56 return this.dragData.repairXY;
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60 * See the {@link Ext.dd.DropZone DropZone} documentation for details about building a DropZone which
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61 * cooperates with this DragZone.
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63 * @param {Mixed} el The container element
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64 * @param {Object} config
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66 Ext.dd.DragZone = function(el, config){
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67 Ext.dd.DragZone.superclass.constructor.call(this, el, config);
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68 if(this.containerScroll){
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69 Ext.dd.ScrollManager.register(this.el);
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73 Ext.extend(Ext.dd.DragZone, Ext.dd.DragSource, {
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74 <div id="prop-Ext.dd.DragZone-dragData"></div>/**
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75 * This property contains the data representing the dragged object. This data is set up by the implementation
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76 * of the {@link #getDragData} method. It must contain a <tt>ddel</tt> property, but can contain
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77 * any other data according to the application's needs.
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79 * @property dragData
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81 <div id="cfg-Ext.dd.DragZone-containerScroll"></div>/**
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82 * @cfg {Boolean} containerScroll True to register this container with the Scrollmanager
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83 * for auto scrolling during drag operations.
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85 <div id="cfg-Ext.dd.DragZone-hlColor"></div>/**
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86 * @cfg {String} hlColor The color to use when visually highlighting the drag source in the afterRepair
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87 * method after a failed drop (defaults to "c3daf9" - light blue)
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90 <div id="method-Ext.dd.DragZone-getDragData"></div>/**
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91 * Called when a mousedown occurs in this container. Looks in {@link Ext.dd.Registry}
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92 * for a valid target to drag based on the mouse down. Override this method
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93 * to provide your own lookup logic (e.g. finding a child by class name). Make sure your returned
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94 * object has a "ddel" attribute (with an HTML Element) for other functions to work.
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95 * @param {EventObject} e The mouse down event
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96 * @return {Object} The dragData
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98 getDragData : function(e){
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99 return Ext.dd.Registry.getHandleFromEvent(e);
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102 <div id="method-Ext.dd.DragZone-onInitDrag"></div>/**
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103 * Called once drag threshold has been reached to initialize the proxy element. By default, it clones the
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104 * this.dragData.ddel
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105 * @param {Number} x The x position of the click on the dragged object
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106 * @param {Number} y The y position of the click on the dragged object
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107 * @return {Boolean} true to continue the drag, false to cancel
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109 onInitDrag : function(x, y){
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110 this.proxy.update(this.dragData.ddel.cloneNode(true));
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111 this.onStartDrag(x, y);
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115 <div id="method-Ext.dd.DragZone-afterRepair"></div>/**
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116 * Called after a repair of an invalid drop. By default, highlights this.dragData.ddel
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118 afterRepair : function(){
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120 Ext.Element.fly(this.dragData.ddel).highlight(this.hlColor || "c3daf9");
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122 this.dragging = false;
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125 <div id="method-Ext.dd.DragZone-getRepairXY"></div>/**
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126 * Called before a repair of an invalid drop to get the XY to animate to. By default returns
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127 * the XY of this.dragData.ddel
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128 * @param {EventObject} e The mouse up event
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129 * @return {Array} The xy location (e.g. [100, 200])
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131 getRepairXY : function(e){
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132 return Ext.Element.fly(this.dragData.ddel).getXY();
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